Fe56(e,α) reaction and its relevance to theE2isoscalar sum rule

The cross section ${}_{}{}^{56}{}_{}{}^{}\mathrm{Fe}$($e$,$\alpha$) has been measured as a function of $\alpha$ energy, lab angle, and incident electron energy. The analyses of these data using distorted-wave Born approximation virtual photon spectra have been performed in the framework of models suggested by the data. We find that the ($e$,$\alpha$) channel exhausts a sizable percentage of the $E2$ isoscalar sum rule.